/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package nl.jteam.jsa.core;

import java.util.Set;

/**
 * Represents a field of a document. A field holds a set of has a name which is unique among all fields in the document
 * it belongs to. A field can an one or more values associated with it.
 *
 * @author Uri Boness
 */
public interface Field extends Boostable {

    /**
     * Returns the name of this field.
     *
     * @return The name of this field.
     */
    String getName();

    /**
     * Returns the single value of this field. If this field holds more than one value, the first one is returned.
     *
     * @return The single value of this field.
     */
    Object getValue();

    /**
     * Returns all values of this field.
     *
     * @return All values of this field.
     */
    Set<Object> getValues();

}
